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Date:   Wed,  1 Jul 2020 17:32:50 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, michael.chan@...adcom.com,
        jeffrey.t.kirsher@...el.com, saeedm@...lanox.com, leon@...nel.org,
        jiri@...lanox.com, snelson@...sando.io, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        danieller@...lanox.com, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next v2 8/9] devlink: Move input checks from driver to devlink

From: Danielle Ratson <danieller@...lanox.com>

Currently, all the input checks are done in driver.

After adding the split capability to devlink port, move the checks to
devlink.

Signed-off-by: Danielle Ratson <danieller@...lanox.com>
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c  | 17 ++---------------
 .../net/ethernet/netronome/nfp/nfp_devlink.c    |  5 +----
 net/core/devlink.c                              | 17 +++++++++++++++++
 3 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 9cd2dc3afb13..eeeafd1d82ce 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -2236,13 +2236,6 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 		return -EINVAL;
 	}
 
-	/* Split ports cannot be split. */
-	if (mlxsw_sp_port->split) {
-		netdev_err(mlxsw_sp_port->dev, "Port cannot be split further\n");
-		NL_SET_ERR_MSG_MOD(extack, "Port cannot be split further");
-		return -EINVAL;
-	}
-
 	max_width = mlxsw_core_module_max_width(mlxsw_core,
 						mlxsw_sp_port->mapping.module);
 	if (max_width < 0) {
@@ -2251,19 +2244,13 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 		return max_width;
 	}
 
-	/* Split port with non-max and 1 module width cannot be split. */
-	if (mlxsw_sp_port->mapping.width != max_width || max_width == 1) {
+	/* Split port with non-max cannot be split. */
+	if (mlxsw_sp_port->mapping.width != max_width) {
 		netdev_err(mlxsw_sp_port->dev, "Port cannot be split\n");
 		NL_SET_ERR_MSG_MOD(extack, "Port cannot be split");
 		return -EINVAL;
 	}
 
-	if (count == 1 || !is_power_of_2(count) || count > max_width) {
-		netdev_err(mlxsw_sp_port->dev, "Invalid split count\n");
-		NL_SET_ERR_MSG_MOD(extack, "Invalid split count");
-		return -EINVAL;
-	}
-
 	offset = mlxsw_sp_local_ports_offset(mlxsw_core, count, max_width);
 	if (offset < 0) {
 		netdev_err(mlxsw_sp_port->dev, "Cannot obtain local port offset\n");
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
index b6a10565309a..be52510d446b 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
@@ -70,9 +70,6 @@ nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
 	unsigned int lanes;
 	int ret;
 
-	if (count < 2)
-		return -EINVAL;
-
 	mutex_lock(&pf->lock);
 
 	rtnl_lock();
@@ -81,7 +78,7 @@ nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
 	if (ret)
 		goto out;
 
-	if (eth_port.is_split || eth_port.port_lanes % count) {
+	if (eth_port.port_lanes % count) {
 		ret = -EINVAL;
 		goto out;
 	}
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 94c797b74378..1adfbf63331a 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -940,6 +940,7 @@ static int devlink_nl_cmd_port_split_doit(struct sk_buff *skb,
 					  struct genl_info *info)
 {
 	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_port *devlink_port;
 	u32 port_index;
 	u32 count;
 
@@ -947,8 +948,24 @@ static int devlink_nl_cmd_port_split_doit(struct sk_buff *skb,
 	    !info->attrs[DEVLINK_ATTR_PORT_SPLIT_COUNT])
 		return -EINVAL;
 
+	devlink_port = devlink_port_get_from_info(devlink, info);
 	port_index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
 	count = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_SPLIT_COUNT]);
+
+	if (!devlink_port->attrs.splittable) {
+		/* Split ports cannot be split. */
+		if (devlink_port->attrs.split)
+			NL_SET_ERR_MSG_MOD(info->extack, "Port cannot be split further");
+		else
+			NL_SET_ERR_MSG_MOD(info->extack, "Port cannot be split");
+		return -EINVAL;
+	}
+
+	if (count < 2 || !is_power_of_2(count) || count > devlink_port->attrs.lanes) {
+		NL_SET_ERR_MSG_MOD(info->extack, "Invalid split count");
+		return -EINVAL;
+	}
+
 	return devlink_port_split(devlink, port_index, count, info->extack);
 }
 
-- 
2.26.2

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